Preselect mechanism



Dec. 30, ,1958 M. WEIDIG 2,365,347

PRESELECT MECHANISM Filed ma 7, 195a 11 Sheets-Sheet 1 I N VEN TOR,

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Dec. 30, 1958 M. WEIDIG PRESELECT MECHANISM Filed May 7, 1956 ll Sheets-Sheet 2 IN V EN TOR. M/L 5 we Dec. 30, 1958 M. WEIDIG PRESELECT MECHANISM Filed May 7, 1956 11 Sheets-Sheet 5 INVENTOR. BY 55 Map/ 0 HTTORNE Y.

Dec. 30, 1958 M. WElDlG 2,866,347

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PRESELECT MECHANISM Filed May 7, 1955 11 Sheets-Sheet 8 IN V EN TOR.

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Dec. 30, 1958 M. WElDlG PRESELECT MECHANISM 11 Sheets-Sheet 9 Filed May '7, 1956 INVENTOR.

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Dec. 30, 1958 Filed May '7, 1956 M. WElDlG PRESELECT MECHANISM MIL ES 11 Sheets-Sheet ll ENTOR.

United States PatentO PRESELECT MECHANISM Miles Weidig, Cincinnati, Ohio, assignor to The Carlton Machine Tool Company, Cincinnati, Ohio, at corporation of Ohio Application May 7, 1956, Serial No. 583,012 7 14 Claims. (Cl. 74-335) for positioning one or more spool valves so that pressure means may be exerted upn a shifter mechanism.

Another object of my invention is to provide a device so constructed and designed that a desired speed and direction of movement for a moving part during the next or successive operation of a work cycle can be preselected while the parts are operable in prior positions.

Another object of my invention is to provide a device, operated by means of a push-button, for positioning shifters.

Another object of my invention is to provide a means of preselecting speed and feed shifters in the transmission of a machine tool, more particularly a drilling machine.

Another object of my invention is to provide a device having a slidable and rotatable drum movable in three directions, having projecting elements on said drum which engage hydraulic valve operating means.

Another object of my invention is to provide a drum having projecting elements adapted to contact the valve operating means which may be moved to a preselected position thereby.

Still another object of my invention is to provide a sliding drum having a series of grooves, adapted to hold a plurality of inserts in predetermined spaced relation.

A still further object of my invention is to provide a mechanism having a drum slidable in two directions, having inserts with projections thereon, arranged about the circumference of said-drum in predetermined positions, adapted upon longitudinal movement of said drum to operate valve control means effected by reason of selected positions of said inserts.

Still another object of this invention is to provide a slidable drum adapted when moved in onev direction to effectuate the operation of predetermined valve operated means and adapted when moved in another direction to effectuate the operation of other predetermined valve operating means. 7

A still further object of my invention is to provide a slidable drum, rotatable upon its axis to cause projections upon said drum to align themselves with sliders.

Another object of my invention is to provide a drum having spaced inserts which initially occupy a position wherein the drum may be rotated to selected position without effecting the valve operating means.

Another object of my invention is to provide an eccentric for moving the drum from a free position to first operative position, and fromthe first operative position to V I Patented Dec. 30.

2 the second operative position and for returning said drum to its free position during the cycle of movement of the eccentric.

A still further object of my invention is to provide in a machine tool transmission means for oppositioning the shiftable elements of the transmission once the shifting cycle has been initiated.

Other objects and objects relating to details of construction and economies of operation will definitely appear from the detailed description to follow.

Y The present invention is useful for a machine tool having a movable part, such as a spindle which carries a tool, and wherein it is desired to impart variable feed and speed rates of movement to said spindle. This is accorn; plished by the selective .mating of gears upon input and output shafts. The gears are positioned for mating by shiftable elements. In my invention the shiftable elements are actuated hydraulically to selected positions.

The invention consists of an arrangement for controlling the movement of valve spools into one of two positions. The valve spools are moved into position by means of sliders. The stems on either side of the double valve spool are forced by means of the sliders to cause the spool to move from a position permitting a cylinder to be vented to a position permitting fluid under pressure to be transmitted to a cylinder to move a piston, to move shifters which move gearing within the transmission of the machine tool. The valve spools are positioned selectively when the sliders are moved upon engagement with inserts which are provided on a slidable rotatable drum. The inserts are positioned relative to the sliders by rotation of the drum and have projecting portions which contact the sliders. The longitudinal movement of the drum is accomplished by means of an eccentrically operated cam-roller actuated by fluid pressure and operating in an annular groove provided on the drum. Initially, this longitudinal movement starts at a first or free position, at which time, none of the inserts is in engagement with the sliders, and is moved to another position which causescertain of the sliders to be moved, according to the position of the inserts projecting from the circumference of the drum.

The second phase of the movement of the drum, in a direction opposite to the direction of the first movement, is not intended to-move any of the inserts.

The third phase of the movement, which is in the same direction as the second phase, is effective to move certain selected sliders. The further operation of the eccentrio is such that the drum is returned to its free position. However, the valve spools remaining in their selected position upon the return of the drum to its free position, permit the operation of the device as to its settable position, without further resort to the selection mechanism.

1 have provided in my invention a plurality of spool valves which are positioned for operation around the circumference of a drum having inserts with projecting ends, settable in predetermined space relation. The series of inserts is mounted in a plurality of adjacent longitudinal rows upon the periphery of the drum. The sliders for operation of the valves have projections which in various selected positions may be engaged by inserts upon the periphery of the drum. The drum is rotated about'its axis manually but is moved longitudinally by an eccentric driven by means of the operation of fluid pressure upon a cylinder containing a piston which is connected to a rack and is returned to its original free position by means of a hydraulic cylinder operated under constant fluid pressure when the first named cylinder is vented.

Thus, with my invention, the selected feed or speed in the transmission of the machine tool may be preset by manipulating a dial for the desired speed orfeed, while the machine is in operation at a prior speed or feed, without disturbing the prior operation or setting. This in effect eliminates the operation of slowing down or stopping the spindle or tool-carrying part of a machine tool While the airspeed or feed is set.

The objects and advantages of the invention will be apparent to those skilled in the art to which it pertains from 'the following description which is described with referenceto the accompaning drawings having identical parts in the several views designated by the same reference characters, and the arrows indicating sectional views are taken looking in the direction of the arrows at the ends of the section lines. a M The invention is illustrated in the following drawings in .which;

. Fig. 1 illustrates a feed drum and a corresponding speed drum mounted on a plate with a portion of the cover member broken away.

Fig, 2 is a view in front elevation'o'f Fig. 1 showing the .feed dial in full anda portion of the speed dial with part broken'away to show the valve positions within the mechanism. I

Fig. 3 is a detailed sectional view taken along the line 3-3 of Fig. 2.

Fig. 4 is a detailed sectional view taken along the line 4+4 of Fig. 3.

Fig. 5 is a view of the drum shown in perspective and showing the inserts mounted therein.

Fig. 6 is a detailed sectional view taken along the line 6--6 of Fig. 3.

Fig. 7 is a view showing the position of the drum and its relation to the valve when the drum is in its free position.

Fig. 8 is a view showing the position of the drum and the valve at the end of the first phase of drum movement.

Fig. 9 is a view showing the position of the drum and its relation to the valve at the end of the second phase of drum movement.

Fig. 10 is a view showing the position of the drum and its relation to the valve at the end of the third phase of operation.

Fig. 11 is a view showing the position of the drum in its free position with the valve remaining the same as at, the end of the third phase of operation.

Fig. 12 illustrates a pair of toothed wheels for holding the respective drum drive shaft in selected angular relation.

Fig. 13 is a schematic diagram showing the operation of a valve used in my invention and illustrates a wiring diagram.

Figure 14 is a view of the head in which the movable tool-carrying part is mounted. Figure 15 is a sectional view of a transmission for moving said tool-carrying part at different rates.

In the drawings I provide a base plate 10 provided with a pair of bracket members 11 and 12 which are .secured to the base plate. A shaft 13 is journalled in the bracket 11. The shaft 14 is journalled in bracket 12. At its other end shaft 13, like shaft 14, is journalled in bracket 24 within end plate 37. Shaft 14 is journalled within the bracket 24 at its other end in a bushing similar to end plate 37. A mounting 15 for the eccentric is provided and secured to the base 10. A valve block 16 is mounted on the base plate 10. The drum 17 is mounted on shaft 13. A similar drum 18 is mounted on shaft 14. Said drum is fixed against rotation on said shaft by means of keys 19 seated in keyways 20, provided on the shaft and keyway 21 provided on the drum (Fig. 4). A similar key arrangement is provided for shaft 14 wherein key 22 holds drum 18 on shaft 14 by reason of its positron in keyway 23. v The drum 17 is provided with slots 25 around its outer periphery which extend longitudinally along a substantial portionof the drum. One end of the drum is provided with an annular groove 26 which cooperates with the eccentric mechanism housed in mount- 4 ing 15 and valve block 16. Each slot is adapted to receive a plurality of inserts 27 (Fig. 5).

The inserts 27 are selectively mounted in series around the drum 17 in the slots 25 provided upon the peripheral portion of said drum. The inserts are secured in position by means of a band such as band 28 slipped over a portion of the insert. In Fig. 5 we show a drum 17 having a series of four bands 28, 29, 30 and 31, for holding a plurality of selected inserts in position. The inserts in the first series 32 are so arranged that only the left portion projects. The inserts in series 36 are so arranged that only the right portion projects. The inserts in series 33, 34 and 35 are so arranged and constructed that either the left or the right portions of the insert project into operable position. The inserts are provided with a projecting portion 40 which is adapted to engage projections like 38 on slider member 41 cooperating with the valves to be described (Fig. 4). v I p .The inserts are provided with a tail portion 39 over which the bands such as 28, 29, 30 and 31'are slid to hold the inserts in selected position. In some positions no inserts are provided. This depends upon the possible combination of valve-operable means desired for any particular machine, which in turn depends upon the feeds and speeds desired. a

The slider 41 may be more clearly understood by refer ence to Figs. 7, 8, 9, 10 and 11. The slider 41 forms a yoke for movement against stems 44 and 45 of a valve spool indicated generally at 46. The valve 46 comprises a valve chamber 47, in which is slidably mounted a valve spool 48 having a pair of spaced lands 49 and 50. The valves are mounted in a valve block 16 (Figs. 2 and 4) and in the embodiment shown in the drawings of this application. I show seven valves for the speed mechanism, each of said valves being provided with a slider 41. Fluid pressureenters through port 52 (Fig. 7) which is under constant pressure. The fiuid enters the chamber 53 between lands 49 and 50, and the fluid is transmitted through the port 54 to a cylinder which moves a shifter for changing the speed gears. This mechanism may comprise a piston which moves against a shifting fork to shift the selected gears. Such a mechanism is not shown in the drawings and may be adapted by those skilled in the art. When the slider 41 is moved to the right as shown in Figs. 10 and 11, the fluid returns from the cylinder through port 54 into the valve chamber 55 ando'ut into the reservoir surrounding the valve mechanism from the valve body.

It is readily observable that upon movement of the shifter to the right fluid is released from the fork shifting mechanism and the fork shifter will return to its neutral orinoperative position. The drum for the feed mechanism corresponds to the drum and valve arrangement described above fo r the speed mechanism. 1 The end of the drum (Figs. 1 and 3) is provided with an annular groove 26. This groove cooperates with the eccentr c mechanism shown in Figs. 3 and 6. The pinion 64 s actuated by means of a rack 62 having a tooth portion 63 with which it meshes. The rack is actuated from a starting position to the end of its operative position as shown in Fig. 6 by means of fluid pressure flowing through the port 65 against the pi ton 66. ,The source of fluid pressure into port 65 is controlled by solenoid valves (not shown), controlled by push-button 76 (Fig. 2) conveniently mounted upon the machine. Another piston 67 is provided adjacent to piston 66 and is secured to a rack 68 having teeth 69 which cooperate with the pinion 64. A port 70 is provided for the application of constant pressure to piston 67. Piston 67 returns piston 66 to its starting position when port 65 is vented due to the variance in the size of the pistons. The racks 68 and 62 are limited in their movement by set screws 71 and 72 mounted within a bracket 73 secured to the bracket 15, by means of bolts .74 and 7,5. The pinion 64v (Figs. 6, 7, 8, 9, 10 and 11) is integral with two eccentric projections 60 and 61. This eccentric mechanism includes a pair of rollers 81 and 82 (Fig. 3) which rotate within the annular groove 26 of the respective drums 17 and 18. The movement of the pinion 64 and eccentric mounted rollers 81 and 82, causes the drums 17 and 18 to be moved in one direction through the first phase of the operation of the device, which is equal to one-third of the total stroke of the rack 62, with distance equal to onehalf of the total distance moved in one direction. During the first phase of the operation a 90 angular move ment of the eccentric rollers 81 and 82 is made in a clockwise direction. In Fig. 7, I show the position of the valve and a slider before any movement is made, thus the drum and eccentric are in the free position with fluid pressure passing through the port 52 and out the port 54. The first 90 movement of the eccentric is illustrated in Fig. 8 with the slider 41 remaining in its selected position.

The second phase of the operation, illustrated in Fig. 9, involves a 90 angular movement of the eccentric rollers 81 and 82 during which time none of the valve sliders, cooperating with the drum inserts, are effected.

The third phase of the operation, illustrated in Fig. 10, consists of a further 90 angular movement of the eccentric causing the drum to be slid so that the projections 40 are moved. These projections are moved against appropriate sliders 41. After the shift has been completed, the port 65 is vented, causing constant fluid pressure exerted on piston 67 through port 70 to become effective to return the eccentric rollers 81 and 82 and the drum upon which the inserts are mounted to their free position permitting the previously selected valve operating means to remain in its operative position.

While said drum is in its free position, and during the operation of the device by means using the valve position previously selected, the drum may be rotated by means of a dial 83 for the feeds, or dial 84 for the speeds, to any new position without in any way effecting the operation of the transmission mechanism.

When the dials 83 and 84 are moved to new selective positions certain inserts on the drums 17 and 18 will be selectively positioned for engagement With their particular sliders 41 during the next shifting operation. The shifting operation is initiated by means of a pushbutton which actuates a valve mechanism by means of solenoid 80 to vent port 65 and apply constant fluid pressure on piston 67.

While I have illustrated the movement of one slider cooperating with one valve, it is understood that various sliders having projecting ends may be moved against other projecting ends on inserts to position other valves.

It is possible, therefore, to move a plurality of shifters through the positioning of a plurality of valve spools with .their respective sliders depending upon the position of the projections on the actuating inserts. In my invention I provide a'slider for each valve. Tw valves may be operated by the inserts 40 in the first series 32. Two other valves may be operated by the inserts 40 in the second series 33. Two additional valves may be made effective by the positioning of the insert in the third series 35 and the remaining valve of my invention is operable by inserts in series 36 (Fig. 5).

In the first series, when the insert has its projection on the left side, the spool valve will be moved to the right during the third phase of the operation (Fig. 10) of the eccentric cam-roller mechanism, and when the insert has its projection on the right side, the valve will be moved to the left during the first phase of the operation of the cam-roller mechanism. Similarly, the operation is accomplished in the same manner for the second, third and fourth series. In Fig. 12 I show a simple method for retaining the shafts 13 and 14 in selective position by means of tooth wheels 90 and 91 being held against the pressure of a spring 92. To accomplish this I provide .the tooth wheel 90, keyed to the shaft 13 and engaged i witha pin 93 whichlis urged against the tooth wheel'by means of a spring-mounted lever 94 pivoted about pin 98. A similar arrangement is provided for shaft '14 by means of tooth wheel 91, pin 95, lever 96 pivoted about pin 97. The entire mechanism is protected by a cover 100, fastened to the base plate 10.

In Fig. 13 I show the hydraulic and electrical circuits schematically when the dials 83 and 84 have been manipulated to preselect a feed and speed. The pushbutton 76 is depressed, closing the electrical circuit and energizing solenoid 80. The solenoid shifts a 3-way valve from its first position to its second position, which serves to connect hydraulic line 109 to 107 and the action of the valve blocks return line 110. A pump 103 forces oil from the sump 106 under pressure into lines 108 and 109. The pressure is maintained in lines 108 and 109 at a predetermined rate by means of relief valve 104. When valve 105 is in its second position, the fluid under pressure is transmitted through line 107 to port 65 actuating pistion 66 (Figure 6). Oil under constant pressure from line 108 is carried to ports 101 and 102 in the valve block which are connected to the supply ports (such as 52, Figs. 7, 8, 9, l0 and 11) of all the valves permitting this oil to be directed as required when the spools of the valves are shifted. After the shifting has been completed the pushbutton 76 is released, the solenoid 80 is thereby deenergized, valve 105 returns to its first position, and line 107 is connected to line and line 109 is blocked. This permits oil to be exhausted from the port 65 to flow through lines 107 and 110 to sump 106. Oil under con stant pressure from line 108 is carried from port 70 to actuate return piston 6'7 (Fig. 6)

In Figure 14 I show a head in which is mounted the tool-carrying part or spindle 120. The spindle is mounted Within the head 121 and the head is slidable on an arm 122. The speeds and feeds are controlled by dials 83 and 84.

In Figure 15 I showv a movable tool-carrying part or spindle 120, and a transmisison for rotating said toolcarrying part or spindle at different rates. This transmission comprises a gear 122 mounted on a spindle sleeve I 126 which meshes with and is driven by a gear 123 mounted upon a shaft 124. The gear 123 is rotated at thirty six different speeds to drive the spindle at thirty six different speeds which are attained by the combination of various gears within the gear train. The sliding gears are moved by means of shifter forks which are controlled hydraulically.

The sliding gear mounted on shaft 124 mesheswith gear 127, which gear is mounted on shaft 128. Gear 125 in the position shown in the drawing is in its free or nondriving position. It is moved to effective driving position downwardly so that it clutches within gear 123 at the same time, by reason of its wide face it remains in mesh with gear 127 which remains in its fixed position. When gear 125 is moved downwardly by means of shifter 129, gear 130 is also moved downwardly to disengage from gear 127.

The next shifter 131 acts to shift gear 132 on spline shaft 133. Gear 132 is a two-step gear and in the position shown its upper portion is driving gear 127. In its lower position gear 132 meshes with gear 134 which is fixed on shaft 128 which drives gear 130 to drive 123 at a different speed;

The above described power paths are obtained by the engagement of sliding gear 135 driving gear 136 which is fixed on shaft 133. Gear 135 in its lower position clutches in to gear 137 and disengages from gear 136. Gear 135 is controlled by shifter 137. The remaining shifters 138 and 139 move various other sliding gears to give different power paths to produce different speeds of gear 123 and consequently the spindle 120.

The power is transmitted through bevel gear 141 to I Referring to Figure 15; I show a power-operated means for effecting shifting of said shiftable elements-comprising various cylinders such as 142.

Without further analysis, the foregoing detailed description will so fully and completely disclose the invention, that others may readily adapt it for other variations by retaining one or more of the features which constitute essential characteristics of the generic or specific aspects of this invention, and therefore, I claim my invention broadly as indicated by the appended claims.

Having thus described the invention, I claim:

1. In a machine tool having a movable tool-carrying part, a transmission for moving said tool-carrying part at different rates icnluding input and output shafts and shiftable elements providing selected speeds and feeds to said tool-carrying part, power operated means for effecting shifitng of said shiftable elements, settable selector means adapted to selectively shift said shiftable elements comprising the combination of, a shaft, a drum rotatable upon said shaft, a plurality of inserts secured upon said drum, projections from said inserts in predetermined spaced relationship, a valve block, a plurality of valves in said valve block shifting devices cooperating with said valves, projections from said valve shifting devices adapted to cooperate with the projections from said drum, each of said valves in said valve block being provided with a pair of ports, one of said ports admitting fluid pressure into its respective valve when the shifting device for said valve is in selected position at which time the other of said ports emits fluid pressure from said valve to selectively position shiftable elements on said input and output shafts.

2. In a machine tool having a movable tool-carrying part, a transmission for moving said tool-carrying part at different rates including input and output shafts and shiftable elements providing selected speeds and feeds to said tool-carrying part, power operated means for effecting shifting of said shiftable elements, settable selector means adapted to selectively shift said shiftable elements comprising the combination of a shaft, a drum rotatable upon said shaft, a plurality of inserts secured upon said drum, projections from said inserts in predetermined spaced relationship, a valve block, a plurality of valves in said valve block shifting devices cooperating with said valves, projections from said valve shifting devices adapted to cooperate with the projections from said drum, each of said valves in said valve block being provided with a pair of ports, one of said ports admitting fluid pressure into its respective valve when the shifting device for said valve is in selected position at which time the other of said ports emits fluid pressure from said valve to selectively position shiftable elements on said input and output shafts, a selector on said drum carrying shaft for selectively positioning said inserts on said drums into cooperating relationship with projections upon said valve shifting devices whereby a selected valve is operable to permit the admission and emission of fiuidpressure whereby a selected shiftable element upon said input and output shaft may be positioned.

3. In a machine tool having a movable tool-carrying part, a transmission for moving said tool-carrying part at different rates including input and output shafts and shiftable elements providing selected speeds and feeds to said tool-carrying part, power operated means for effecting shifting of said shiftable elements, settable selector means adapted to selectively shift said shiftable elements comprising the combination of a shaft, a drum rotatable upon said shaft, a plurality of inserts secured upon said drum, projections from said inserts in predetermined spaced relationship, a valve block, a plurality of valves in said valve block shifting devices cooperating with said valves, projections from said valveshifting devices adapted to cooperate with the projections from said drum, each of said valves in said valve block being provided with a pair of ports, one of said ports admitting fluid pressure into its respective valvewhen theshifting device for said valveis in selected position'a't which time the other of said ports emits fluid pressure from said valve to selectively position shiftable elements on said input and output shafts and means for moving said drums longitudinally upon said shaft whereby the projections upon said inserts in said drum are caused to engage the projections upon said valve shifting devices, said drum moving means comprising an eccentric cam roller, a pinion, a pair of racks engaging said pinion, a piston for each rack, a chamber in which said piston may be reciprocated, each of said chambers having a port for admission of fluid pressure, one of said ports provided for admitting fluid under constant pressure, the

other of said ports adapted for admitting fluid under pressure in response to a solenoid controlled valve actuated by pushbutton mechanism carried by the machine tool, said second named port of said drum actuating means having an area of greater diameter than the first named port under constant fluid pressure.

4. In a machine tool having a movable tool-carrying part, a transmission for moving said tool-carrying part at different rates including input and ouput shafts and shiftable elements providing selected speeds and feeds to said tool-carrying part, power operated means for effecting shifting of said shiftable elements, settable selector means adapted to selectively shift said shiftable elements comprising the combination of a shaft, a drum rotatable upon said shaft, a plurality of inserts secured upon said drum, projections from said inserts in predetermined spaced relationship, a valve block, a plurality of valves in said valve block shifting devices cooperating with said valves, projections from said valve shifting devices adapted to cooperate with the projections from said drum, each of said valves in said valve block being provided with a pair of ports, one of said ports admitting fluid pressure into its respective valve when the shifting device for said valve is in selected position at which time the other of said ports emits fluid pressure from said valve to selectively position shiftable elements on said input and output shafts, and means for moving said drum longitudinally upon said shaft comprising a fluid pressure cam operating mechanism controlled by a solenoid actuated fluid control valve, a first cycle of movement for said drum whereby certain projections upon said drum are moved to one position to move said valves in said valve block, a second cycle of movement of said drum in response to said cam operated drum moving mechanism which is ineffective to move any of said projections connected to said valves, a third cycle of operation to move other projections upon said inserts in said valve block, and means for venting the second named port to cause said rack to complete the cycle.

5. In combination, a plurality of shifting devices, a valve means controlled by said valve for shifting each of said devices, a shaft, a drum slidable upon said shaft, a series of selector elements for each of said devices, said selector elements fixed to said drum, a valve for each of said shift devices, selector elements connected to said valves and means for selectively presenting said first namedselector elements'to said second named selector elements and then, by longitudinal movement of said drum, to control the operation of said valves through said elements.

6. In combination, a plurality of shifting devices, a valve means controlled by said valve for shifting each of said devices, a shaft, a drum slidable upon said shaft, a series of selector elements for each of said devices, said selector elements fixed to said drum, a valve for each of said shift devices, selector elements connected to said valves and means for selectively presenting said first named selector elements to said second named selector elements and a cam operated valve control mechanism for longitudinally moving said drum relative tosaid shaft whereby said shaft is movable through a work cycle to selectively position said shifting devices.

7. A preselect mechanism for machine tools having a transmission having gears mounted upon input and output shafts, and shiftable elements for moving said gears to selected positions comprising the combination of a drum manually rotatable upon a shaft, means for manipulating said drum, a plurality of inserts secured upon said drum, projections from said inserts in predetermined spaced relationship, a valve block, a plurality of valves in said valve block, shifting devices cooperating with said valves, projections from said valve shifting devices adapted to cooperate with projections from said drum, each of said valves in said valve block being provided with a pair of ports, one of said ports admitting fluid pressure into its respective valve when the shifting device for said valve is in selected position at which time the other of said ports emits fluid pressure from said valve to selectively position shiftable elements on said input and output shafts.

8. preselect mechanism for a machine tool having a transmission unit having gears mounted upon input and output shafts and shiftable elements for moving said gears to selected positions comprising the combination of a shaft, a rotatable drum slidable longitudinally upon said shaft, means for rotating said drum, a series of se lector elements on said drum, a valve having means to cooperate with said selector elements, said last named means comprising sliders for moving said valves, pro ections upon said sliders to cooperate with said selector elements and means for moving said drum in opposed relation to said projections on said sliders to open or close selected valves whereby fluid pressure is admitted and emitted from said valve housings to control said shiftable elements.

9. A preselect mechanism for a machine tool having a transmlssion unit having gears mounted upon input and output shafts, and shiftable elements for moving said gears to selected positions comprising the combination of, a shaft, a manipulatable rotatable drum slidable longitudinally upon said shaft, a series of selector elements projecting from said drum, a valve block, a plurallty of valves in said valve block, means for selectively positioning said valves, the said last named means comprising sliders for moving said valves, selector elements on said drum, projections Irom said sliders adapted to cooperate with selector elements on said drum to actuate said valves to selectively admit or emit fluid pressure from said valves to control selected shiftable elements.

10. A preselect mechanism for a machine tool having a transmission unit having gears mounted upon input and output shafts, and shiftable elements for moving said gears to selected positions comprising the combination of a shaft, a manipulatable rotatable drum slidable upon said shaft, 21 series of selector elements projecting from said drum, a valve block, a plurality of valves in said valve block, means for selectively positioning said valves, the said last named means comprising sliders for moving said valves, selector elements on said drum projections from said sliders, projections from said selector elements on said drum, said projections on said selector elements on said drum and projections on said sliders, cooperating to actuate said valves, means for sliding said drum to actuate selective valves to control selected shiftable ele ments.

11. A preselect mechanism for a machine tool having a transmission unit having gears mounted upon input and output shafts, for transmitting variable speeds to a tool carrying part and shiftable elements for moving said gears to selected positions comprising the combination of a shaft, a manipulatable rotatable drum slidable upon said shaft, a series of selector elements projecting from said drum, a valve block, a plurality of valves in said valve block, means for selectively positioning said valves, the said last named means comprising sliders for moving said valves, selector elements on said drum projections from said sliders, projections from said selector elements on said drum, said projections on said selector elements on said drum and projections on said sliders cooperating to actuate said valves, means for sliding said drum to actuate selective valves to control selected shiftable elements, said means comprising a cam operated valve control mechanism including a cam roller adapted to move the drum through a work cycle to position preselected projections on said valves so that selected valves conduct fluid pressure to said shifting elements.

12. A preselect mechanism comprising the combination of a solenoid control valve actuated by push button mechanism, a drum, said drum rotatable upon a shaft, means for selectively rotating said drum, means for longitudinally sliding said drum comprising an eccentric cam roller, a pinion, a pair of racks engaging said pinion, a piston for each rack, a chamber in which said piston may be reciprocated, each of said chambers having a port for admission of fluid pressure, one of said ports provided for admitting fluid under constant pressure, the other of said ports adapted for admitting fluid under pressure in response to solenoid control valve actuated by pushbutton mechanism, said second named port of said drum actuating means having an area of greater diameter than the first named port under constant fluid pressure, a series of selector elements projecting from said drum, a valve block, a plurality of valves in said valve block, means for selectively positioning said valves, the last named means comprising sliders for moving said valves, selector elements on said drum, projections from said sliders adapted to cooperate with selector elements on said drum, when said drum is moved longitudinally.

13. A preselect mechanism for machine tools comprising the combination of a pair of drums, each rotatable upon a shaft, dial means for presetting each of said drums, cam operating means for simultaneously longitudinally sliding said drums, a plurality of projections from said drums, a valve block, a plurality of valves in said valve block, a portion of which cooperate with each drum, a plurality of projections from said valves, said drum projections and said valve projections cooperating upon the r simultaneous movement of said drums.

14. A preselect mechanism for a machine tool, having a transmission unit having gears mounted upon input and output shafts for transmitting variable speeds and feeds to a tool carrying part, and shiftable elements for moving said gears to selected positions comprising the combination of, a pair of drums, each rotatable upon a shaft, dial means for presetting each of said drums, cam operating means for simultaneously longitudinally sliding said drums, a plurality of projections from said drums, a valve block, a plurality of valves in said valve block, a portion of which cooperate with each drum, a plurality of projections from said valves, said drum projections and said valve projections cooperating upon a simultaneous movement of said drums, means connecting said valves with said shiftable elements, means for sliding said drums comprising a cam operated control valve mechanism, including a pair of cam rollers adapted to move said drums simultaneously through a Work cycle to position preselected projections on said valves, so that said valves conduct fluid pressure to said shifting elements.

References Cited in the file of this patent UNITED STATES PATENTS 2,109,070 MacKenzie Feb. 22, 1938 2,633,861 Gardiner Apr. 7, 1953 2,670,633 Schoepe et al Mar. 2, 1954 2,712,140 Curtis et al. July 5, 1955 2,728,242 De Vlieg Dec. 27, 1955 2,774,250 Gallimore -2 Dec. 18, 1956 

